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LM2575电感发烫是什么原因造成的?

Other Parts Discussed in Thread: LM2575

LM2575选用手册给的典型电路,输入+15v输出+5v,电感容量为330uh,负载不超过1A,但是有的板子电感发烫,而有的不发烫,这是什么原因造成的?